Chuck



CHUCK FiledV may L 1925 3fm/9061701 wat@ Patented Apr. 7, 1925.

UNITED STATESA PATENT oFFicE.

VIRGINIA, ASSIGNOR T THE IYICCONELL- OF RICHMOND, VIRGINIA, A. CORPORATION A CHUCK.

Application led May 1,

To all who-m t mayconcera: v

Be it known that I, 'Hanny R. MQCON- NELL, a citizen of the United States,`resid ing at Richmond, Vin the county of Henrico and State of Virginia, have invented certain new and useful Improvements Yin Chucks, of which the following is a specification.

This invention relates to chucks and more particularly to such devices of the character shown in my oopending applications Serial No. 617,592, led February 7, 1923, and Serial No. 629,907, tiled April Ll, 1923.

In my copending applications above referred to I disclosed chucks kemploying a body portion having a plurality of gripping jaws having threaded engagement with` a rotatable sleeve, which, upon rotation, is adapted to move the jaws into engagement with the shank of va tool, a second rotatable sleeve being provided which has rotatable end to end engagement with the first mentioned sleeve and which is adapted to be moved a slight distance longitudinally by a cam action when the sleeve is rotated, thus moving the first sleeve a sufficient distance longitudinally together with the jaws to effect an unusually secure gripping action yof the jaws about the tool. f t is an importantobject of the present invention to provide novel operating means for chucks of .the character outlined above which will be particularly desirable in connection with chucks used on certain forms of drills particularly electric drills, where it is often difficult to secure proper access to the chuck to permit proper tightening ofthe jaws. l l

@ther objectsand advantagesy of the invention will be apparent during the course of the following description.

In the drawings I have shown one embodiment of the invention.k In this showing, Figure 1 is a side elevation of the chuck, Figure 2 is a central longitudinal sectional view on line 2-2 of Figure 5,

Figure 3 is a sect-ion taken on line 3-43 of Figure 2,

Figure Figure 5 is a section Ataken on line 5575 of Figure 1,.

Figure 6 1s a perspective view of the operating member, and,

4 1s a bottom plan view of the ca.p,"

1923. serial No. 635,964.

Figure 7 is a detailed view of one of the jaw members.

Referring to. the drawings, the numeral 10 designates the body portion of the chuck having an enlarged lower end 11. The upper vend of the body portion is reduced and cylindrical in form as shown at 12. lThe upper end o-f the body portion is provided with an opening 13 for the reception of the lower end of a drill spindle 1li. The body portion 10 is provided with a plurality of downwardlyA convergingv openings 15 in which are mounted jaw members 16.Y The jaw members 16 are provided with gripping edgesvl'? arranged substantially parallel to the axis of the spindle. The upper ends of the aw members are reducedas at 18 Aand are provided Vupon theirouter faces with relatively high pitch threads 19.

A rotatable sleeve 20 surrounds t-he body portion vimmediately above the enlarged lower end 11 thereof and this sleeve is provided with a depending annular lip 21 surrounding the enlarged end ofthe body por tion. The lip 21, the lower end ofthe sleeve 20 `and a groove in theupper end of the enlarged end 11 of the body portion cooperate to form a ball race in which are mounted anti-friction balls 22. The sleeve 20'is provided adj acentthe ball race with an opening V23 through which the balls 22 may be inserted and this opening is normally'closed by a. plug 24 driven therein. yThe sleeve 2O is provided internally with threads 25 engaging the threads '19 of the jaw members whereby rotation of the sleeve 2O will effect downward and inward movement of the lower ends of the jaw members, or vice versa. The sleeve 2O is provided in one side with a 'circula-r recess 26 for a purpose to be described. l

A second sleeve 27 surrounds the body portion immediately above the sleeve 20. Anti-friction balls 28 are mounted between the adjacent ends of the sleeve 20 and27 to reduce friction between these parts. The sleeve 27 is provided with a depending annular lip29 which surrounds the upper end of the sleeve 2O as shown in Figure 2 and the lower end ofthis lip is provided with gear teeth 8O arranged slightly above the opening 26. The upper face of the sleeve 27 is provided with inner and -outer circular cam Lgrooves 3l which increase gradually in depth throughout their circumference, and stop pins 32 are arranged between the high and lo'w points of these grooves as shown in Figure 3.

A Vcap 38"surroundsfthe upper-'end 'ofthe cylindrical portion l2 'or' the body portion and preferably has a driving tit therewith to form, in ell'ect, an integral part the'remta rllhe cap 33 is provided at its lower and with a dependingannular lip 34 which surrounds the reduced upper end of the sleeve 27. The lower face of the cap 33 is pre.- videld with inner and outer cam grooves -35 which are arranged respectively above the inner and outer grooves 3l of the sleeve 2i". As in the case of the grooves 3l, the grooves 35 increase gradually in depth throughout their circumference and are p rovided between theirhigh and low points with stop pins 3o. As will `be's'een from an examination ol Fire lures and il, the grooves increase in depth in the direction opposite that ot the grooves lwhen the cap is placed in position. Antilriction balls 37 are mounted 'in tie 0iro'oves 81 and extend into the grooves 35. The balls .in each `groove 3l extend throughout Substantially one-hall" the length ofthe groovesandy are `preferably equal in number and maintained in proper spaced relation by an aperturcd plate 88. lt will be apparent that rotation ol the sleeve 2T is limited in both 'directions by contact between the 'stoprfins and 56 and the anlit'riction'balls The numeral 39 designates, as a whole, an 'operatingineinberfcomprising a shank dell.) andai-handle 4l, The inner end of the shank 4G, is provided'with a circular pin Z2adapted''to be received in the opening 26 as shown in-Figure 2. The inner end oit the shank LO is l'provided with gear teeth i3 which are adapted to mesh with the teeth ZiOfof the sleeve 27.

permit the fshanks of' the tools to 'be in` serte'd or withdrawn. As 'seen inv Figure rotationef thes'leeve 2O in a vcou'nter-c'lo'ck- 4`wil'se direction, looking from the top, will effect the downward and inward movement of t .el jaws lfwhil'e' clockwise rotation 'of the sleeve `27 'will etle'ct aslight downward erably such that movement of the 'jaws y about the tool.

movement of this sleeve as the balls 3?' are moved toward the shallower portions or' the grooves V3l and lf3/Then tlieballs 87 are arranged in the'deeper portions oi their grooves, the sleeve 20 is adapted to partake of limited "longitudinal movement. lli-The ris desired toinsert a tool, thesleeve is rotated in a counter clockn'fise direction, vballs Si' traveling toward the deeper porthe 2O will cause this member thento move upwardly to take upthe vertical play be tween it and the sleeve Q7 and enlarged l() of the body portion." `Rotation or the sleeve 20 as described is facilitated by use of the oaerating member 39. lll/Then the sleeve 27 is rotated to bring the ballsrll 4to the deeper-p'ortionsothe grooves, the sleeve 2T 'may be steadied by the hand oft' the operator while the movement of the en d sleeve Q0 is accomplished by rotating the M handle lll. Since the sleeve 27 at this time 'will be lstationary it will benpparent that the shank 4G or the operating 'member will rotate'with the sleeve 20. This movement 'ofthe shankl() with the sleeve 20 however will be' quite limited 'due to the pitch oit the lthreads 19 'and 25 as described.. l/Vhen the 'vertical play of ythe sleeve Q0 has been taken up, furtherl rotation ofthe sleeve 20 will be prevented and further rotation of Ythe handle l0 `in the saine direction as previously will rotate the sleeve I? in a clockwise direction with the balls 37 travelii'ig toward the shallower portions off the groov 3l and' Awhereby the sleeve 2T, together Y with the sleeve Qt) andthe liaw members will be moved downwardly a'slight `distance to veEe'ct a tight gripping'action or the jaws The "chuck VandV the tool in serted therein are then ready for operation. It will be 'apparent that the tool may be quickly removed when desired by again inserting the pinoli?, within the opening 26 and rotating'the handle ili'n the A'opposite direction. rfhis action will rotate the sleeve '27 to 'n'iove'thefbal'ls 37 toward the deeper end ot't'he 'grooves `3l and 35 until further movement oftl'iefsleeve? is kprevented by 'the stop v'pins B2 and 36. Further 'rotation of the handle 41 will Lthen quickly release the aw member'slfrom the tool whereupon it 'may be withdrawnfrom the chuck.

t is to be understood that the'torin ot vmyinVentron herewiths'hown v'and described is to be ltaken as a preferred-'e same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

l. A chuck comprising a body portion, jaw members slidably mounted in said body portion and adapted to be gripped-about a tool, a. pair of sleeves surrounding said body p0rtion and oppositely rotatable, each of said sleeves being arranged to move all of the jaw members simultaneously into engagement with the tool, and an operating member connected between said sleeves and adapted to effect successive rotation of said sleeves in opposite directions.

2. A chuck comprising a body portion, a single set of downwardly converging jaw members slidably mounted in said body por tion and adapted to be gripped about a tool, a sleeve engaging said set of jaw members and rotatable in one direction to move them into engagement with the tool, said sleeve being capable of limited longitudinal movement, a second sleeve surrounding said body portion in rotatable end to end engagement with said first named sleeve, and means for moving said second named sleeve toward said iirst named sleeve when it is rotated in the opposite direction thereot, said sleeves ieing provided with portions adapted for engagement with a tool whereby successive rotation et said sleeves in opposite directions is eiifected.

3, A chuck comprising a body portion, a single set of downwardly converging jaw members slidably mounted in said body por tion and adapted to be gripped about a tool, a sleeve engaging said set of jaw members te move them int-o engagement with the tool, said sleeve being capable of limited longitudinal movement, a second sleeve surrounding said body portion'in rotatable end to end engagement with said first named sleeve,

means for'moving said second named sleeve longitudinally when it is rotated, one of said sleeves being provided with gear teeth, the other of said sleeves being providedfwith an opening, and an operating member provided with an axial pin adapted to be received in said opening and a pinion adapted to engage ysaid gear teeth whereby rotation of the oper'- ating member is adapted to effect successive rotation of said sleeves in opposite directions.

4. A chuck comprising a body portion, a single set of downwardly converging jaw members slidably mounted in said body portion and adapted to be gripped about a tool, a sleeve having threaded engagement with said set of jaw members to move them toward and away from the tool, said sleeve being capable of limited longitudinal movement, a second sleeve surrounding said body portion inlrotatable end to end engagement with said first named sleeve, means connected between saidbody portion and said second named sleeve for moving the latter longitudinally toward said rst named sleeve when it is rotated in one direction, means for limiting rotation ot said second named sleeve, said first named sleeve being oppo sitely rotatable to move said members into engagement with the tool, one of said sleeves being provided in one side with an opening, the other of said sleeves being provided with gear teeth adjacent said opening, and an operating member provided with an axial pin adapted to be received in said opening and a pinion adapted to engage said gear teeth whereby rotation of the operating member is adapted to effect suc-' cessive rotation of said sleeves in opposite directions. p

ln testimony whereof I my signature in presence ot two witnesses.

, HARRY R. MCCONNELL. Witnesses:

M. AGATHA TYNDALL, CHAS. A. CLARK. 

